National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

41°F

5°C

Humidity 62%
Wind Speed SW 7 mph
Barometer 30.15 in (1021.4 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 12 Jan 4:54 pm CST
Extended Forecast for

Decatur Airport IL

  • Tonight

    Tonight: Mostly cloudy during the early evening, then becoming clear, with a low around 33. South southwest wind 8 to 11 mph, with gusts as high as 21 mph.

    Low: 33 °F

    Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 53. West wind 13 to 17 mph, with gusts as high as 29 mph.

    High: 53 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35. West wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature falling to around 26 by 5pm. Breezy, with a north northwest wind 15 to 23 mph, with gusts as high as 38 mph.

    High: 35 °F⇓

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 13. North northwest wind 13 to 18 mph, with gusts as high as 30 mph.

    Low: 13 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 28. Northwest wind 8 to 13 mph becoming west southwest in the afternoon. Winds could gust as high as 18 mph.

    High: 28 °F

    Sunny

  • Thursday Night

    Thursday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 21. South southwest wind 8 to 14 mph, with gusts as high as 21 mph.

    Low: 21 °F

    Chance Snow

  • Friday

    Friday: A 40 percent chance of snow after noon. Mostly cloudy, with a high near 37.

    High: 37 °F

    Mostly Cloudy
    then Chance
    Snow

  • Friday Night

    Friday Night: A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 15.

    Low: 15 °F

    Chance Snow
    then Mostly
    Cloudy

Detailed Forecast

Tonight
Mostly cloudy during the early evening, then becoming clear, with a low around 33. South southwest wind 8 to 11 mph, with gusts as high as 21 mph.
Tuesday
Partly sunny, with a high near 53. West wind 13 to 17 mph, with gusts as high as 29 mph.
Tuesday Night
Mostly cloudy, with a low around 35. West wind 10 to 14 mph, with gusts as high as 23 mph.
Wednesday
Mostly cloudy, with a temperature falling to around 26 by 5pm. Breezy, with a north northwest wind 15 to 23 mph, with gusts as high as 38 mph.
Wednesday Night
Partly cloudy, with a low around 13. North northwest wind 13 to 18 mph, with gusts as high as 30 mph.
Thursday
Sunny, with a high near 28. Northwest wind 8 to 13 mph becoming west southwest in the afternoon. Winds could gust as high as 18 mph.
Thursday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 21. South southwest wind 8 to 14 mph, with gusts as high as 21 mph.
Friday
A 40 percent chance of snow after noon. Mostly cloudy, with a high near 37.
Friday Night
A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 15.
Saturday
Mostly cloudy, with a high near 23.
Saturday Night
Mostly cloudy, with a low around 6.
Sunday
Partly sunny, with a high near 21.
Sunday Night
Partly cloudy, with a low around 10.
M.L.King Day
Mostly sunny, with a high near 27.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.88°W (Elev. 650 ft)
Last Update:
3:36 pm CST Jan 12, 2026
Forecast Valid:
5pm CST Jan 12, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation